arm64: dts: qcom: x1-denali: Fix microphone distortion

Browse source

The microphones (2x) on Surface Pro 11 are currently ususable due to a
misconfigured sample rate, which results in a very distorted recording
with the voice barely audible.

Under Windows, the DMIC0_CTL register is set to 0x00000005 while
recording:

   bit 0 = 1 --> DMIC0 enabled
bits 3:1 = 2 --> DMIC clock divider = /4

The current dmic-sample-rate of 4800000 corresponds to the default DMIC
clock divider of /2.

Dropping dmic-sample-rate to 2400000 sets the divider to /4, matching
the working Windows configuration and resulting in perfect audio.

While we're at it, remove the reference to dmic23_default, as we only
have two microphones and don't need to configure the pins for a 3rd/4th
microphone.

Signed-off-by: Dale Whinham <daleyo@gmail.com>
Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260830-surface-pro-11-mic-fix-v1-1-36a53140373b@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

...

This commit is contained in:

Dale Whinham 2026-08-30 18:40:07 +01:00 • committed by Bjorn Andersson

parent cee9395acd

commit 35ce3c5712

1 changed files with 2 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

arch/arm64/boot/dts/qcom/x1-microsoft-denali.dtsi

View file